On which of the following types of tests do adults retain the most skill well into old age?
a. unspeeded and crystallized
b. crystallized and speeded
c. fluid and non-verbal
d. fluid and verbal
A
Psychology
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What is a central requirement of an experimental design?
A) Manipulation of an independent variable. B) Random selection of participants from the broader study population. C) The inclusion of subject variables in the study design. D) Manipulation of a dependent variable.
Psychology
How can researchers study differences between two or more groups of subjects who may react differently to some test or experience?
A) Use a placebo control group B) Use subject characteristics as a dependent variable C) Use subject characteristics as an independent variable D) Use a within-subjects design
Psychology